/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// net_wins.c

#include "quakedef.h"
#include "winquake.h"

#define MAXHOSTNAMELEN		256

static int net_acceptsocket = -1;		// socket for fielding new connections
static int net_controlsocket;
static int net_broadcastsocket = 0;
static struct qsockaddr broadcastaddr;

static unsigned long myAddr;

qboolean	winsock_lib_initialized;

#include "net_wins.h"

int winsock_initialized = 0;
WSADATA		winsockdata;

//=============================================================================

static double	blocktime;

BOOL PASCAL FAR BlockingHook(void)
{
    MSG		msg;
    BOOL	ret;

    if ((Sys_FloatTime() - blocktime) > 2.0)
    {
        WSACancelBlockingCall();
        return FALSE;
    }

    /* get the next message, if any */
    ret = (BOOL) PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);

    /* if we got one, process it */
    if (ret)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    /* TRUE if we got a message */
    return ret;
}


void WINS_GetLocalAddress()
{
    struct hostent	*local = NULL;
    char			buff[MAXHOSTNAMELEN];
    unsigned long	addr;

    if (myAddr != INADDR_ANY)
        return;

    if (pgethostname(buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
        return;

    blocktime = Sys_FloatTime();
    WSASetBlockingHook(BlockingHook);
    local = pgethostbyname(buff);
    WSAUnhookBlockingHook();
    if (local == NULL)
        return;

    myAddr = *(int *)local->h_addr_list[0];

    addr = ntohl(myAddr);
    sprintf(my_tcpip_address, "%d.%d.%d.%d", (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff, addr & 0xff);
}


int WINS_Init (void)
{
    int		    i;
    char	    buff[MAXHOSTNAMELEN];
    char	    *p;
    int		    r;
    HINSTANCE   hInst;

// initialize the Winsock function vectors (we do this instead of statically linking
// so we can run on Win 3.1, where there isn't necessarily Winsock)
    hInst = LoadLibrary("wsock32.dll");

    if (hInst == NULL)
    {
        Con_SafePrintf ("Failed to load winsock.dll\n");
        winsock_lib_initialized = false;
        return -1;
    }
    winsock_lib_initialized = true;

    pWSAStartup = (void *)GetProcAddress(hInst, "WSAStartup");
    pWSACleanup = (void *)GetProcAddress(hInst, "WSACleanup");
    pWSAGetLastError = (void *)GetProcAddress(hInst, "WSAGetLastError");
    psocket = (void *)GetProcAddress(hInst, "socket");
    pioctlsocket = (void *)GetProcAddress(hInst, "ioctlsocket");
    psetsockopt = (void *)GetProcAddress(hInst, "setsockopt");
    precvfrom = (void *)GetProcAddress(hInst, "recvfrom");
    psendto = (void *)GetProcAddress(hInst, "sendto");
    pclosesocket = (void *)GetProcAddress(hInst, "closesocket");
    pgethostname = (void *)GetProcAddress(hInst, "gethostname");
    pgethostbyname = (void *)GetProcAddress(hInst, "gethostbyname");
    pgethostbyaddr = (void *)GetProcAddress(hInst, "gethostbyaddr");
    pgetsockname = (void *)GetProcAddress(hInst, "getsockname");

    if (!pWSAStartup || !pWSACleanup || !pWSAGetLastError ||
        !psocket || !pioctlsocket || !psetsockopt ||
        !precvfrom || !psendto || !pclosesocket ||
        !pgethostname || !pgethostbyname || !pgethostbyaddr ||
        !pgetsockname)
    {
        Con_SafePrintf ("Couldn't GetProcAddress from winsock.dll\n");
        return -1;
    }

    if (COM_CheckParm ("-noudp"))
        return -1;

    if (winsock_initialized == 0)
    {
        r = pWSAStartup (MAKEWORD(1, 1), &winsockdata);

        if (r)
        {
            Con_SafePrintf ("Winsock initialization failed.\n");
            return -1;
        }
    }
    winsock_initialized++;

    // determine my name
    if (pgethostname(buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
    {
        Con_DPrintf ("Winsock TCP/IP Initialization failed.\n");
        if (--winsock_initialized == 0)
            pWSACleanup ();
        return -1;
    }

    // if the quake hostname isn't set, set it to the machine name
    if (Q_strcmp(hostname.string, "UNNAMED") == 0)
    {
        // see if it's a text IP address (well, close enough)
        for (p = buff; *p; p++)
            if ((*p < '0' || *p > '9') && *p != '.')
                break;

        // if it is a real name, strip off the domain; we only want the host
        if (*p)
        {
            for (i = 0; i < 15; i++)
                if (buff[i] == '.')
                    break;
            buff[i] = 0;
        }
        Cvar_Set ("hostname", buff);
    }

    i = COM_CheckParm ("-ip");
    if (i)
    {
        if (i < com_argc-1)
        {
            myAddr = inet_addr(com_argv[i+1]);
            if (myAddr == INADDR_NONE)
                Sys_Error ("%s is not a valid IP address", com_argv[i+1]);
            strcpy(my_tcpip_address, com_argv[i+1]);
        }
        else
        {
            Sys_Error ("NET_Init: you must specify an IP address after -ip");
        }
    }
    else
    {
        myAddr = INADDR_ANY;
        strcpy(my_tcpip_address, "INADDR_ANY");
    }

    if ((net_controlsocket = WINS_OpenSocket (0)) == -1)
    {
        Con_Printf("WINS_Init: Unable to open control socket\n");
        if (--winsock_initialized == 0)
            pWSACleanup ();
        return -1;
    }

    ((struct sockaddr_in *)&broadcastaddr)->sin_family = AF_INET;
    ((struct sockaddr_in *)&broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST;
    ((struct sockaddr_in *)&broadcastaddr)->sin_port = htons((unsigned short)net_hostport);

    Con_Printf("Winsock TCP/IP Initialized\n");
    tcpipAvailable = true;

    return net_controlsocket;
}

//=============================================================================

void WINS_Shutdown (void)
{
    WINS_Listen (false);
    WINS_CloseSocket (net_controlsocket);
    if (--winsock_initialized == 0)
        pWSACleanup ();
}

//=============================================================================

void WINS_Listen (qboolean state)
{
    // enable listening
    if (state)
    {
        if (net_acceptsocket != -1)
            return;
        WINS_GetLocalAddress();
        if ((net_acceptsocket = WINS_OpenSocket (net_hostport)) == -1)
            Sys_Error ("WINS_Listen: Unable to open accept socket\n");
        return;
    }

    // disable listening
    if (net_acceptsocket == -1)
        return;
    WINS_CloseSocket (net_acceptsocket);
    net_acceptsocket = -1;
}

//=============================================================================

int WINS_OpenSocket (int port)
{
    int newsocket;
    struct sockaddr_in address;
    u_long _true = 1;

    if ((newsocket = psocket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
        return -1;

    if (pioctlsocket (newsocket, FIONBIO, &_true) == -1)
        goto ErrorReturn;

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = myAddr;
    address.sin_port = htons((unsigned short)port);
    if( bind (newsocket, (void *)&address, sizeof(address)) == 0)
        return newsocket;

    Sys_Error ("Unable to bind to %s", WINS_AddrToString((struct qsockaddr *)&address));
ErrorReturn:
    pclosesocket (newsocket);
    return -1;
}

//=============================================================================

int WINS_CloseSocket (int socket)
{
    if (socket == net_broadcastsocket)
        net_broadcastsocket = 0;
    return pclosesocket (socket);
}


//=============================================================================
/*
============
PartialIPAddress

this lets you type only as much of the net address as required, using
the local network components to fill in the rest
============
*/
static int PartialIPAddress (char *in, struct qsockaddr *hostaddr)
{
    char buff[256];
    char *b;
    int addr;
    int num;
    int mask;
    int run;
    int port;

    buff[0] = '.';
    b = buff;
    strcpy(buff+1, in);
    if (buff[1] == '.')
        b++;

    addr = 0;
    mask=-1;
    while (*b == '.')
    {
        b++;
        num = 0;
        run = 0;
        while (!( *b < '0' || *b > '9'))
        {
            num = num*10 + *b++ - '0';
            if (++run > 3)
                return -1;
        }
        if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
            return -1;
        if (num < 0 || num > 255)
            return -1;
        mask<<=8;
        addr = (addr<<8) + num;
    }

    if (*b++ == ':')
        port = Q_atoi(b);
    else
        port = net_hostport;

    hostaddr->sa_family = AF_INET;
    ((struct sockaddr_in *)hostaddr)->sin_port = htons((short)port);
    ((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (myAddr & htonl(mask)) | htonl(addr);

    return 0;
}
//=============================================================================

int WINS_Connect (int socket, struct qsockaddr *addr)
{
    return 0;
}

//=============================================================================

int WINS_CheckNewConnections (void)
{
    char buf[4096];

    if (net_acceptsocket == -1)
        return -1;

    if (precvfrom (net_acceptsocket, buf, sizeof(buf), MSG_PEEK, NULL, NULL) > 0)
    {
        return net_acceptsocket;
    }
    return -1;
}

//=============================================================================

int WINS_Read (int socket, byte *buf, int len, struct qsockaddr *addr)
{
    int addrlen = sizeof (struct qsockaddr);
    int ret;

    ret = precvfrom (socket, (char *) buf, len, 0, (struct sockaddr *)addr, &addrlen);

    if (ret == -1)
    {
        int _errno = pWSAGetLastError();

        if (_errno == WSAEWOULDBLOCK || _errno == WSAECONNREFUSED)
        {
            return 0;
        }
    }
    return ret;
}

//=============================================================================

int WINS_MakeSocketBroadcastCapable (int socket)
{
    int	i = 1;

    // make this socket broadcast capable
    if (psetsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)
        return -1;
    net_broadcastsocket = socket;

    return 0;
}

//=============================================================================

int WINS_Broadcast (int socket, byte *buf, int len)
{
    int ret;

    if (socket != net_broadcastsocket)
    {
        if (net_broadcastsocket != 0)
            Sys_Error("Attempted to use multiple broadcasts sockets\n");
        WINS_GetLocalAddress();
        ret = WINS_MakeSocketBroadcastCapable (socket);
        if (ret == -1)
        {
            Con_Printf("Unable to make socket broadcast capable\n");
            return ret;
        }
    }

    return WINS_Write (socket, buf, len, &broadcastaddr);
}

//=============================================================================

int WINS_Write (int socket, byte *buf, int len, struct qsockaddr *addr)
{
    int ret;

    ret = psendto (socket, (const char *) buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr));

    if (ret == -1)
    {
        if (pWSAGetLastError() == WSAEWOULDBLOCK)
        {
            return 0;
        }
    }
    return ret;
}

//=============================================================================

char *WINS_AddrToString (struct qsockaddr *addr)
{
    static char buffer[22];
    int         haddr;
    haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);
    sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff, (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs(((struct sockaddr_in *)addr)->sin_port));
    return buffer;
}

//=============================================================================

int WINS_StringToAddr (char *string, struct qsockaddr *addr)
{
    int ha1, ha2, ha3, ha4, hp;
    int ipaddr;

    sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
    ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;

    addr->sa_family = AF_INET;
    ((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);
    ((struct sockaddr_in *)addr)->sin_port = htons((unsigned short)hp);
    return 0;
}

//=============================================================================

int WINS_GetSocketAddr (int socket, struct qsockaddr *addr)
{
    int addrlen = sizeof(struct qsockaddr);
    unsigned int a;

    Q_memset(addr, 0, sizeof(struct qsockaddr));
    pgetsockname(socket, (struct sockaddr *)addr, &addrlen);
    a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
    if (a == 0 || a == inet_addr("127.0.0.1"))
        ((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr;

    return 0;
}

//=============================================================================

int WINS_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
    struct hostent *hostentry;

    hostentry = pgethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET);
    if (hostentry)
    {
        Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);
        return 0;
    }

    Q_strcpy (name, WINS_AddrToString (addr));
    return 0;
}

//=============================================================================

int WINS_GetAddrFromName(char *name, struct qsockaddr *addr)
{
    struct hostent *hostentry;

    if (name[0] >= '0' && name[0] <= '9')
        return PartialIPAddress (name, addr);

    hostentry = pgethostbyname (name);
    if (!hostentry)
        return -1;

    addr->sa_family = AF_INET;
    ((struct sockaddr_in *)addr)->sin_port = htons((unsigned short)net_hostport);
    ((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];

    return 0;
}

//=============================================================================

int WINS_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)
{
    if (addr1->sa_family != addr2->sa_family)
        return -1;

    if (((struct sockaddr_in *)addr1)->sin_addr.s_addr != ((struct sockaddr_in *)addr2)->sin_addr.s_addr)
        return -1;

    if (((struct sockaddr_in *)addr1)->sin_port != ((struct sockaddr_in *)addr2)->sin_port)
        return 1;

    return 0;
}

//=============================================================================

int WINS_GetSocketPort (struct qsockaddr *addr)
{
    return ntohs(((struct sockaddr_in *)addr)->sin_port);
}


int WINS_SetSocketPort (struct qsockaddr *addr, int port)
{
    ((struct sockaddr_in *)addr)->sin_port = htons((unsigned short)port);
    return 0;
}

//=============================================================================
